John mocxney



(N0 Modell) J. MOONEY; SCREW CLAMP.

No. 378,896 Patented Mar. 6, 1888.

\Yxwswa NITED STATES PATENT @FFIC E.

JOHN MOONEY, OF SYRACUSE, NEW YORK.

SCREW-CLAMP.

SPECIFICATION forming part of Letters Patent No. 378,896, dated March 6,1888.

Application filed September 27, 1886. Serial No. 214,623. (No model.)

To all whom, it may concern.-

Be it known that I, JOHN MOONEY, of Syracuse, Onondaga county,.in theState of New York, have invented certain new and useful Improvements inScrew-Clamps, of which the following is a description.

My improvements are for the purpose of holding firmly the article to beclamped, whether having parallel, irregular, orinclined surfaces in anydirection, by means of a strong and cheap construction.

My implement is described as follows, referring to the accompanyingdrawings, in which Figure 1 is a side elevation with all the partsunited; Fig. 2, asimilar view with the bed and follower plates removed;Fig. 3, a sectional plan of the bed-rest on line yy of Fig. 2; Fig. 4.,a vertical section on line .90 as, Fig. 1.

The several parts in the differentfigures are designated by likeletters.

The frame of the clamp is of the usual form,

' consisting of the main bar a, with aprojection at right angles at eachend, forming the bedrest and screw'holder, through the end of whichlatter a screw, b, runs parallel with the main bar a. Into thisprojection a thimble, c, is fitted, on which the female screw is formedto fit screw 1), having a flange on the under side to resist the thrustof the screw 0. By this arrangement the thimble 0 can readily bereplaced when worn out, and the clamp quickly 7 and cheaply repaired.

The bed-rest or projection a has upon its inner face two elevations orbosses, p 10, raised above its surface, that form limited bearings attwo points to afford a steady and even rest, upon which the article tobe clamped bears when the bed-plate dis not in use. This bed-rest a hasa dovetail rib along its upper face, on which the bed-plate d slides.The main bar a has a Tshaped rib along its inner face, which guides theend of the follower-bar, that is grooved to loosely embrace it. Thisfollowerbar is pivoted to the end of the screw 11 by a ball-and-socketjoint, so as to assume different angles to adapt itself to the work tobe clamped. This bar 6 is formed on its face similarly to the bed-resta, having a dovetail rib along its lower edge to receive thefollower-plate e, which is readily slid onto or off the bar 6 to suitthe purpose for which it is desired.

The follower and bed plates are useful in wood-work and such articles aswould be injured by the narrow rest and bar.

Having thus fully described my improved screw-clamp, what I claimtherein as new is 1. As an article of manufacture, a malleableeast-metal clamp, a a, as herein described, formed of a single U-shapedcasting having a stationary removable thimble, c, as set forth, incombination therewith, for the purposes described.

2. In a screw-clamp, as herein described, the combination of thefollower'bar e, having aT-formed groove in one end thereof,with the mainbar a, having a rib thereon, the counterpart in its cross-section of thegroove on the follower-bar sliding thereon, by which the bar is held inposition in the manner herein described.

3. In a screw-clamp formed of the frame a a, as described, and thefollower-bar e, the removable sliding follower-plate e, constructed andcombined as and for the purposes specified.

4.. In the screw-clamp herein described, the combination of the slidingbed-plate (Z with the lower bar of the frame a constructed as hereindescribed.

JOHN MOONEY.

l/Vitnesses:

J. J. GREENOUGH, P. F. DWYER.

